{"id":86642,"date":"2020-06-27T19:42:50","date_gmt":"2020-06-27T17:42:50","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-modulya-lkrg-0-8-dlya-zashhity-ot-ekspluataczii-uyazvimostej-v-yadre-linux"},"modified":"2020-06-27T19:42:50","modified_gmt":"2020-06-27T17:42:50","slug":"vypusk-modulya-lkrg-0-8-dlya-zashhity-ot-ekspluataczii-uyazvimostej-v-yadre-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/vypusk-modulya-lkrg-0-8-dlya-zashhity-ot-ekspluataczii-uyazvimostej-v-yadre-linux","title":{"rendered":"LKRG 0.8 moduli v\u00e4ljaanne Linuxi tuuma haavatavuste kaitseks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Openwall projekt <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/announce\/2020\/06\/25\/1\">avalikustas<\/a><\/noindex> tuuma mooduli vabastamine <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lkrg\/\">LKRG 0.8<\/a><\/noindex>  (Linux Kernel Runtime Guard), mis on m\u00f5eldud tuvastama ja blokeerima r\u00fcnnakuid ning t\u00f5rkeid tuuma struktuurides. N\u00e4iteks saab moodul kaitsta volitamata muudatuste tegemise eest t\u00f6\u00f6tavas tuumas ja kasutaja protsesside privileegide muutmise katsete eest (eksploitide rakendamise tuvastamine). Moodul sobib nii olemasolevate kernelite eksploitide kaitseks (n\u00e4iteks olukordades, kus s\u00fcsteemis on probleemne tuuma v\u00e4rskendamine) kui ka veel tundmatute haavatavuste eksploitide t\u00f5rjumiseks. Projekti kood <noindex><a rel=\"nofollow\" href=\"https:\/\/bitbucket.org\/Adam_pi3\/lkrg-main\/src\/master\/\">levitatakse<\/a><\/noindex> on GPLv2 litsentsi all.<\/p>\n<p>Uues versioonis on j\u00e4rgmised muudatused:<\/p>\n<ul>\n<li class=\"l\">  LKRG projekti positsioneerimine on muutunud, n\u00fc\u00fcd ei jagata seda eraldi all\u00fcksusteks, et kontrollida integriteeti ja tuvastada eksploitide rakendamist, vaid see esitatakse tervikliku tootena r\u00fcnnakute ja erinevate integriteedi h\u00e4irimiste tuvastamiseks;\n<li class=\"l\">  Tagatakse \u00fchilduvus Linuxi kernelitega alates 5.3 kuni 5.7, samuti kernelitega, mis on kompileeritud agressiivsete GCC optimeerimistega, ilma CONFIG_USB ja CONFIG_STACKTRACE valikuteta v\u00f5i CONFIG_UNWINDER_ORC valikuga, samuti kernelitega, milles puuduvad LKRG katkestustavad funktsioonid, kui nende puudumine ei takista toimimist;\n<li class=\"l\">  Kompileerimise k\u00e4igus kontrollitakse m\u00f5ningaid kohustuslikke CONFIG_* seadeid tuuma jaoks, et jagada arusaadavaid veateateid ebaselgete t\u00f5rgete asemel;\n<li class=\"l\">  Lisatud tugi oote(ACPI S3, suspend to RAM) ja unere\u017eiimide(S4, suspend to disk) jaoks;\n<li class=\"l\">  Makefile'le on lisatud DKMS tugi;\n<li class=\"l\">  Eksperimentaalne tugi 32-bitistele ARM platvormidele on ellu viidud (testitud Raspberry Pi 3 Model B peal). Varasemalt saadaval olnud AArch64 (ARM64) tugi on t\u00e4iendatud Raspberry Pi 4 plaadi \u00fchilduvuse tagamisega;\n<li class=\"l\">  Uued k\u00e4itlejad (hook) on lisatud, sealhulgas capable() kutsumise k\u00e4itleja, et paremini tuvastada ekspluateerimisi, mis manipuleerivad &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/www.man7.org\/linux\/man-pages\/man7\/capabilities.7.html\">capabilities<\/a><\/noindex>&#171;, mitte protsesside identifikaatoritega (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.man7.org\/linux\/man-pages\/man7\/credentials.7.html\">credentials<\/a><\/noindex>);\n<li class=\"l\">  Pakutakse v\u00e4lja uus loogika nime ruumide piirangutest v\u00e4ljumise katsete tuvastamiseks (n\u00e4iteks Docker konteineritest);\n<li class=\"l\">  x86-64 s\u00fcsteemides on tagatud SMAP (Supervisor Mode Access Prevention) bitide kontrollimine ja rakendamine, mis on m\u00f5eldud kasutajaandmete ligip\u00e4\u00e4su blokeerimiseks privileege omava koodi poolt, mis t\u00f6\u00f6tab tuuma tasandil. SMEP (Supervisor Mode Execution Prevention) kaitse rakendati varem;\n<li class=\"l\">  T\u00f6\u00f6 k\u00e4igus tagatakse LKRG seadet piisava m\u00e4lu lehek\u00fcljel, mis on tavaliselt ainult lugemiseks ette n\u00e4htud;\n<li class=\"l\">  Logide logitavat teavet, mis v\u00f5ib olla r\u00fcnnakute jaoks k\u00f5ige kasulikum (n\u00e4iteks tuumadresside teave), tuleb piirata silumise re\u017eiimiga (log_level=4 ja k\u00f5rgem), mis on vaikimisi v\u00e4lja l\u00fclitatud.\n<li class=\"l\">  Protsesside j\u00e4lgimise andmebaasi skaleeritavust on suurendatud \u2014 \u00fche RB puu, mida kaitseb \u00fcks spinlock, asemel on kasutusele v\u00f5etud 512 RB puu hargnevat tabelit, mida kaitseb vastavalt 512 lugemis-kirjutamisblokeeringut;\n<li class=\"l\">  On rakendatud ja vaikimisi lubatud re\u017eiim, kus protsessi tuvastamise terviklikkuse kontrollimist tehakse sageli ainult praeguse \u00fclesande jaoks, samuti valikuliselt aktiveeritavate (\u00e4rkavate) \u00fclesannete jaoks. \u00dclej\u00e4\u00e4nud, magamise v\u00f5i kontrollitava LKRG API tuuma kaudu t\u00f6\u00f6tavate \u00fclesannete puhul toimub kontroll harvemini.\n<li class=\"l\">  LKRG peenh\u00e4\u00e4lestuseks on lisatud uusi sysctl ja mooduli parameetreid, samuti kaks sysctl, mis lihtsustavad seadistamist, valides arendajate ettevalmistatud peenh\u00e4\u00e4lestuste komplektid (profiilid);\n<li class=\"l\">  Vaikimisi seadeid on muudetud, et saavutada paremini tasakaalustatud tasakaal rikete tuvastamise operatiivsuse ja reageerimise efektiivsuse vahel, samuti j\u00f5udluse ja valeh\u00e4irete riski vahel;\n<li class=\"l\">  Systemd \u00fcksuse fail on \u00fcmber t\u00f6\u00f6tatud, et laadida LKRG moodul varases laadimisetapis (mooduli v\u00e4ljal\u00fclitamiseks v\u00f5ib kasutada tuuma k\u00e4surea parameetrit);\n<\/ul>\n<p>Arvestades uue v\u00e4ljaande optimeerimisi, hinnatakse j\u00f5udluse langust LKRG 0.8 rakendamisel vaikere\u017eiimis (&#171;heavy&#187;) olevat 2.5% ja kergetes re\u017eiimides (&#171;light&#187;) 2%. <\/p>\n<p>Hiljuti korraldatud <noindex><a rel=\"nofollow\" href=\"http:\/\/jultika.oulu.fi\/files\/nbnfioulu-202004201485.pdf\">uurimine<\/a><\/noindex> LKRG ruttkiti tuvastamiseks  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/lkrg-users\/2020\/06\/14\/5\">n\u00e4itas<\/a><\/noindex> sai parimaid tulemusi, tuvastades 8 9 testitud ruttkitist, mis t\u00f6\u00f6tavad tuumal, ilma valeh\u00e4ireteta (tuvasid ruttkitid Diamorphine, Honey Pot Bears, LilyOfTheValley, Nuk3 Gh0st, Puszek, Reptile, Rootfoo Linux Rootkit ja Sutekh, kuid j\u00e4ttis tuvastamata Keysnifferi, mis on tuumamoodul klahvivahendiga, mitte ruttkit tegelikus m\u00f5ttes). V\u00f5rdluseks, AIDE, OSSEC ja Rootkit Hunter tuvastasid 2 ruttkit 9-st, samas kui Chkrootkit ei tuvastanud \u00fchtegi. Samuti ei toeta LKRG kasutaja ruumis paiknevate ruttkitide tuvastamist, seega saavutatakse k\u00f5ige suurem efektiivsus AIDE ja LKRG kombinatsiooniga, mis v\u00f5imaldas tuvastada 14 15 ruttkitist k\u00f5ikide t\u00fc\u00fcpide seas.<\/p>\n<p>Lisaks v\u00f5ib m\u00e4rkida, et jaotuse arendaja <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51009\">Whonix<\/a><\/noindex> alustas <noindex><a rel=\"nofollow\" href=\"https:\/\/www.whonix.org\/wiki\/Linux_Kernel_Runtime_Guard_LKRG\">valmistatud<\/a><\/noindex> pakettide koostamist DKMS jaoks Debianile, Whonixile, Qubesile ja Kicksecure'ile, ning pakett <noindex><a rel=\"nofollow\" href=\"https:\/\/aur.archlinux.org\/packages\/lkrg-dkms\/\">Arch Linux<\/a><\/noindex> on juba v\u00e4rskendatud versioonini 0.8. LKRG paketid on samuti saadaval Venemaal. <noindex><a rel=\"nofollow\" href=\"https:\/\/packages.altlinux.org\/ru\/sisyphus\/srpms\/kernel-source-lkrg\">ALT Linux<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52955\">Astra Linux<\/a><\/noindex>.<\/p>\n<p>LKRG-s teostatakse terviklikkuse kontrolli alusel aktiveerimist, v\u00f5rreldes praegust koodi ja tuuma ning moodulite andmeid, m\u00f5ningate oluliste andmestruktuuride ja CPU seadistustega salvestatud hash'ide v\u00f5i vastavate m\u00e4lupiirkondade, andmestruktuuride v\u00f5i registrite koopiatega. Kontrollimisi aktiveeritakse nii perioodiliselt taimeri alusel kui ka erinevate s\u00fcndmuste toimumisel.<\/p>\n<p>V\u00f5imalike eksploiteerimisv\u00f5tmete kindlakstegemine ja r\u00fcnnakute blokeerimine toimub enne operatsioonis\u00fcsteemi juurdep\u00e4\u00e4su andmist ressurssidele (n\u00e4iteks enne faili avamist), kuid p\u00e4rast protsessi volitamata \u00f5iguste omandamist (n\u00e4iteks UID muutmine). Volitamata k\u00e4itumise tuvastamisel l\u00f5petatakse protsesside tegevus vaikimisi, mis on piisav paljude eksploiteerimiste blokeerimiseks.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53244\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u043e\u0435\u043a\u0442 Openwall \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0432\u044b\u043f\u0443\u0441\u043a \u043c\u043e\u0434\u0443\u043b\u044f \u044f\u0434\u0440\u0430 LKRG 0.8 (Linux Kernel Runtime Guard), \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u043e\u0433\u043e \u0434\u043b\u044f \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f \u0438 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0430\u0442\u0430\u043a \u0438 \u043d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u0439 \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u0438 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440 \u044f\u0434\u0440\u0430. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043c\u043e\u0434\u0443\u043b\u044c \u043c\u043e\u0436\u0435\u0442 \u0437\u0430\u0449\u0438\u0442\u0438\u0442\u044c \u043e\u0442 \u043d\u0435\u0441\u0430\u043d\u043a\u0446\u0438\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u0432\u043d\u0435\u0441\u0435\u043d\u0438\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432 \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0435\u0435 \u044f\u0434\u0440\u043e \u0438 \u043f\u043e\u043f\u044b\u0442\u043e\u043a \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u043f\u043e\u043b\u043d\u043e\u043c\u043e\u0447\u0438\u0439 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432 (\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432). \u041c\u043e\u0434\u0443\u043b\u044c \u043f\u043e\u0434\u0445\u043e\u0434\u0438\u0442 \u043a\u0430\u043a \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u0443\u0436\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u0445 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432 \u0434\u043b\u044f \u044f\u0434\u0440\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-86642","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u043e\u0435\u043a\u0442 Openwall \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0432\u044b\u043f\u0443\u0441\u043a \u043c\u043e\u0434\u0443\u043b\u044f \u044f\u0434\u0440\u0430\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/et\/blog\/news\/vypusk-modulya-lkrg-0-8-dlya-zashhity-ot-ekspluataczii-uyazvimostej-v-yadre-linux\" 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